Free Online UUID Generator (GUID)

Getting Started

Using the UUID Generator is simple and straightforward:

Basic Usage

1. Generate UUID: Click the "Generate" button to create a new UUID instantly.
2. Copy UUID: Click the copy button next to any UUID to copy it to your clipboard.
3. Bulk Generation: Enter the number of UUIDs you want to generate (1-100) and click "Generate Bulk".
4. Clear All: Remove all generated UUIDs to start fresh.

UUID Versions

• UUID v1 (Time-based): Generated from timestamp and node ID. Sortable by creation time, useful for time-series data. Contains timestamp information making it partially predictable.
• UUID v3 (MD5 hash): Generated from a namespace and name using MD5 hashing. Deterministic - same namespace and name always produce the same UUID. Useful for creating consistent IDs from known values.
• UUID v4 (Random): Generated using cryptographically strong random numbers. Most commonly used version. Provides maximum unpredictability and security.
• UUID v5 (SHA-1 hash): Similar to v3 but uses SHA-1 hashing instead of MD5. Preferred over v3 for better collision resistance. Also deterministic based on namespace and name.

Format Options

• Standard: 8-4-4-4-12 format with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000)
• Uppercase: All letters in uppercase
• Lowercase: All letters in lowercase (default)
• No Hyphens: Remove all hyphens for compact format

Key Features

• All UUID Versions: Support for v1 (time-based), v3 (MD5), v4 (random), and v5 (SHA-1)
• Bulk Generation: Generate up to 100 UUIDs at once
• Format Options: Uppercase, lowercase, with or without hyphens
• Namespace Support: DNS and URL namespaces for v3/v5 generation
• Deterministic UUIDs: Create consistent UUIDs from names using v3/v5
• One-Click Copy: Copy individual UUIDs or all at once
• Local Generation: All UUIDs generated in your browser for privacy
• No Limits: Generate as many UUIDs as you need

When to Use Each Version

• Use v1: When you need sortable IDs or want to track creation time
• Use v3/v5: When you need deterministic UUIDs from names (e.g., generating UUIDs from domain names or URLs)
• Use v4: For general purpose unique IDs where randomness is preferred (most common)